With modern turbo engines, the issues of struggling performance and smoke emissions that were common with older naturally aspirated petrol and diesel engines have been significantly reduced. Turbo engines provide better power and torque, resulting in improved performance without the need for excessive fuel consumption. Additionally, turbo engines are more efficient and produce fewer emissions, making them a more environmentally friendly option compared to older engines. Overall, the advancements in turbo engine technology have made these issues less noticeable in today's cars. **